Revolving door



April 1 1924.

J. F. SUNDERLAND REVOLVING DOOR Filed May 28. 1920 Lrw ' To all whom it may concern:

Patented Apr. 1, 1924. p I 1 UNITED STATES PATENT OFFICE;

J'OEN SUNDERLAND, OF NATICK, MASSACHUSETTS.

nnvonvmo noon.

Application filed Kay 28, 1920. Serial No. 384,958.

Be it known that I,J0HN F. SUNDERLAND, a citizen of the United States, and a resident of the town of Natick, in the county of Mid-.

dlesex and State of Massachusetts, have invented certain new and useful Improvements in Revolving Doors, of which the following is a' description. 7

The present invention relates to improvements in revolving doors, and particularly a revolving door of the type disclosed in my 7 U. S. Patent, No. 1,303,988, dated May 20,

- I I oring to get out of the building.

An object of the present invention is to provide in addition to the means for enabling the doors to be collapsed by means of an unusual pressure, an emergency 'door ed to operate thereleasing opening device, which may beoperated to relieve the yielding holding force normally upon the doors entirely, so that the doors may be freely swung about the central pivot shaft. 1 V

. A further object is to provide such emergency devices at each of the severalcompartments of the door, any one of which is adaptmeans of all of the 'doors.

With these and other objects in view, an embodimentof my invention is shown in the accompanying drawings, and this embodiment will be hereinafter more fully described with reference thereto, and the invention will be finally pointed out in the claims.

- In the accompanying drawings:

Figure 1 is a view in elevation of a revolving door disposed in the exit-of a building, and embodying my improvement.

Figure 2 is a view in elevation of the lower portion of a. door, with parts broken away.

Figure 3 is a horizontal sectional view takenalong the. line 33 of Figure 2, and

. showing in dotted lines, the collapsible position of two of the door sections.

Figure' l is a view in elevation of one of the door sections, showing the emergency releasing means operated to release the door.

Similar reference characters indicate corresponding Radially mounted upon the parts throughout the several figures of the drawings.

Referring to the cording to the present embodiment of my invention, comprises a 'i'evolving central shaft 10 and four door sections or wings 11 radially disposed about the shaft. 'At the bottom of the door there is provided upon the 1 shaft 10, a disc 12, disposed in spaced relation to the end of the shaft 10, and extending into cut-out portions 13 of the door sections, side plates 14 and 15 being disposed about said cut-out portionsand the disc and ex tending above the disc, as at 14: and 15. Upon the under side of the disc there is provided a large'square geared portion 16, and parallel'with the sides thereof, and intermediate the periphery of the disc and said sides, there are provided slots or grooves 17 forming a square about the uared gear. oor section there is provided a ental gear 18 meshmg with the teeth o the squared gear 16," and provided at its upperside with a roller 19 engaging the slot or groove 17.

Upon the upper side of the disc 12 there are provided four small discs 20, having their axes parallel to the axis of the shaft .10, and located substantially midway between the ends ofthe slots 17 andcentrally thereof. These discs 20 and the large squared gear are rigid with the disc 12, and may be integrally formed therewith. In the upper surface of each of the discs 20 there are provided a plurality of radial grooves 21, and superimposed upon each of the discs there is provided a. disc 22 rotatable with respec't'thereto, and having a central stud or pin 23 resting in a socket 23" provided centrally of the disc 20, and upon the face of the disc 22, engaging the disc 20, there is provided a single diametric rib 24 adapt ed to fit into one of the grooves 21 of the disc 20. The rib'24, as well as the grooves 21 are semicircularin cross, section, although they may be V-shaped or of any other suitable shape adaptedto permit of disengage ment of the rib fromthe groovesby relative turning"movement of the disc '22. The disc 22 is provided with a'recess .25- extending inwardly from the periphery thereof, which, in normal position of the wings, is engaged by a pin 26 carried by the door section or wing. The disc 22 is held yieldingly against the disc 20 by means of a spring 27 mounted upon a rod 28, projecting upwardly drawings, the door,

from the disc 22, the spring engaging the under side of a vertically movable head 29 having a socket engaging the end. of the rod 28,. and slidably movable upon the end of the rod 28, said shaft being disposed within a cut-out portion 31 of the door section, or Wing-concealed beneath the portions 13 and 14 of the side plates 13 and 14. Above the shaft there is provided a transversely disposed shaft 32, journaled at its ends in the portions 13 and 14 of the sideplates 13 and 14, and provided between the said plates with a cam member 33, having a portion of its periphery fiat, as at 34, and the remainder concentric to the shaft 32. Upon each end of the shaft 32 there is provided a lever arm engaged by a stop 36 in its lowered position, shown in Figure 2, and adapted to be engaged by a stop 37 in its raised position. In the lowered position of the lever arm the head 29 is engaged v by the concentric portion ofthe cam, and the spring 27 is compressed, so that the disc 22 is held yieldingly in engagement with the disc 20. This is the normal position of the door, and when unusual pressure is exerted thereon, the tendency of the pin 26 to rotate the disc 22 will be suiii 'ciently great to cause the holding force of the spring 27 to be overcome, and the rib 24 to be moved out of one of the grooves 21, so that the door may be. collapsed, as shown in Figure 3. In the raised position of the'arm 35 the flat portion 34 of the cam is disposed above the head 29, so that-the pressure of the spring 27 upon the plate.22

is removed, and, therefore, the same is free to be rotated, so that the door may be collapsed by relatively slight pressure thereon.

The lever arm 35 may be moved to raised position manually or by means of the foot,-

, to release any one of the several doors.

In order to release all of the doors simultae neously, the lever arms are connected by cords '38 to a common connection piece 39 disposed within the hollow shaft 10, several metal cords 38 extending over sheaves or guide rollers 40, and extending upwardly from the connection piece 39 there are provided cords 41 corresponding in number to the cords 38 extending over sheaves or guide rollers 42, and provided at their ends with handles 43 disposed respectively within the several compartments of the door. These handles are preferably formed of sheet Lmetal or other suitable material, and may have inscribed thereon Emergency door I as opening device or other wording of similar intent. By pulling any one ofthe handles 43, all of the lever arms 35 will be raised, thus releasing all of the doors, thereby allowing the same to freely fold fiat upon each other in an outward position, or in the direction of traflic through the exit. Thus in the event of a panic, the first person enaxes, yieldable and liftable means normally holding the doors extended and adapted to yield under slightly abnormal pressure, a common connection to said liftable means movable up and down relatively on the support, and individual operating means for each door coupled to said connection for simultaneously permitting of the collapse of all of the doors.

.2. In a revolving door, a revolving support, a plurality of wings normallyradiating from said support and connected-therewith to swing relatively thereto, holding means adapted to'normally hold said wings in radial position, means adapted to release the respective holding means of said doors to permit independent swinging thereof, andv releasing means disposed in each of the compartments between said respective lastmentioned means, said last-mentioned releasing means being operatively connected together, operation of anyone of said lastmentioned releasing means adapted to operate all of said means for releasing the respective wings to permit relative swinging movement of said wings about said support.

3. In a'revolving door structure, a support, a plurality of doors pivoted in the support and revolvingv about the support, latch means to individually hold the doors in extended position, said latch means being yieldable and liftable upwardly to separately release the doors by slightly. abnormal pressure, and means to lift said latch means whereby to simultaneously free all of the doors and permit of the collapse of the same. I J

4. in a. revolving door, a revolving support, a plurality of wings normally radiating from said support, plates mounted to turn on said support about axes parallel to that of the support, and also movable lengthwise of said axes, springs tending to force said plates lengthwise of their axes toward said support and into holding engagement therewith, cooperating means on the wings and on the respective plates normally in engagement to. connect the wings with said plates, but adapted to be brought out of en agement to release the wings, cam meansa apted in one position to tension said springs to force said plates toward said neeepea fi' I support, and in another position to release operation of any one of said last-mentioned said springs to permit free swinging movemeans adapted to operate all of said cam 10 ment of said wings, operating means conmeans to permit swinging movement of'said nected to the respective cam means of said wings.

7 Wings, a common connection for said oper- In testimony that I claim" the foregoing L ating means, and means extending from asmy invention, I have slgned my 'name.

said. common connection to the several comhereunder.

partments of the (1001' between said wings, JOHN F. SUNDEERLAND: 

